The word "Jobby" coming from the Scottish for shit/poo, a "Jobby Jabber" concerns the act of sneaking up behind a friend/foe while pressing both hands together into a "praying" position, then forcibly ramming pointed fingers up the (fully clothed) arse of said friend/foe, shouting "JOBBY JABBER!". Remember to run away to avoid violent repurcussions; laughing is optional.

An homosexual ; a man who engages as the active partner in anal sex with another man. From "jobby" (faecal solid) + "jab" (to prong or spear). It should be noted that some may consider this term offensive - it is favoured by homophobes due to its low potential for "re-appropriation" by the homosexual community (see example).

To 'Jobby Jabber' someone is to sneak up behind them with your hands together (as if in prayer) and 'jab' them in the 'gooch' (the area between the anus and the scrotum).

"Holy fuck by the way! Ye want tae a fuckin seen the jobby jabber a dun tae Ricky, he fuckin made a mad noise like a dug gettin hit by a motur!"
"A dare ye tae Jobby Jabber that polismin! A fuckin dare ye!"
"Yer maws got a heavy growler! A went tae Jobby Jabber her n a loast a finger!"